Summer North Atlantic Jet (NAJ) reconstruction from 1725-2012 CE Trouet, V.; Babst, F.; Meko, M. Trouet, V. Babst, F. Meko, M. Atmospheric and Oceanic Circulation Patterns Reconstruction earth science/paleoclimate/climate reconstructions|tree ring (age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (jet stream position,null,one standard error upper bound,degree north,Aug,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (jet stream position,null,two standard error upper bound,degree north,Aug,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/instrumental (jet stream position,null,null,degree north,Aug,instrumental,null,null,N,Twentieth Century Reanalysis; instrumental latitudinal position) earth science/paleoclimate/climate reconstructions|tree ring (jet stream position,null,one standard error lower bound,degree north,Aug,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (jet stream position,null,null,degree north,Aug,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (jet stream position,null,two standard error lower bound,degree north,Aug,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/reconstructions (Eastern North Atlantic>LATITUDE >LONGITUDE ) A recent increase in mid-latitude extreme weather events has been linked to Northern Hemisphere polar jet stream anomalies. To put recent trends in a historical perspective, long-term records of jet stream variability are needed. Here we combine two tree-ring records from the British Isles and the northeastern Mediterranean to reconstruct variability in the latitudinal position of the high-summer North Atlantic Jet (NAJ) back to 1725 CE. We find that northward NAJ anomalies have resulted in heatwaves and droughts in northwestern Europe and southward anomalies have promoted wildfires in southeastern Europe. We further find an unprecedented increase in NAJ variance since the 1960s, which co-occurs with enhanced late twentieth century variance in the Central and North Pacific Basin. Our results suggest increased late twentieth century interannual meridional jet stream variability and support more sinuous jet stream patterns and quasi-resonant amplification as potential dynamic pathways for Arctic warming to influence mid-latitude weather. STUDY NOTES: Tree-ring based reconstruction of the latitudinal position of the North Atlantic Jet Stream in August. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Trouet, V. Investigator : Babst, F. Investigator : Meko, M. 2018-01-25 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/23350 https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/trouet2018/trouet2018-NAJ.txt https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/trouet2018/trouet2018-NAJ.txt English https://www.ncdc.noaa.gov/paleo/study/23350 https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/trouet2018/trouet2018-NAJ.txt Trouet, V., F. Babst, and M. Meko2018Recent enhanced high-summer North Atlantic Jet variability emerges from three-century contextNature Communications9118010.1038/s41467-017-02699-3https://www.nature.com/articles/s41467-017-02699-3 START YEAR: 1725 AD * END YEAR: 2012 AD -30 0 -10 90